New measurement of the weak mixing angle

本项目将测量粒子物理标准模型的基本物理参数--弱混合角。该参数控制弱场的混合，并与W玻色子和Z玻色子的质量有关。这次测量将分析欧洲核子研究中心大型强子对撞机ATLAS实验中的Run2和Run3数据。方法学将在轻子衰减角的可观测范围内对Z玻色子的产生进行高精度的测量。这个能观量可以用来构造所谓的Z玻色子衰变的前向后向不对称。测量到的不对称性将被用来提取弱混合角。FITS还将同时限制质子的部分子密度函数，这是系统不确定性的最大来源。这种测量预计将达到与早期轻子对撞机结果相媲美的精度，并将在强子对撞机上首次实现这一突破性的成就。

This project will measure the fundamental physics parameter of the Standard Model ofParticle Physics - the weak mixing angle. This parameter controls the mixing of the weakfields and is related to the masses of the W and Z bosons. The measurement will analysethe Run2 and Run3 data from the ATLAS experiment at CERN's Large Hadron Collider. Themethodology will be to perform a high precision measurement of the Z boson production inthe observable of the leptonic decay angle. This observable can be used to construct aso-called forward-backward asymmetry of the Z boson decays. The measured asymmetry will befitted to extract the weak mixing angle. The fits will also simultaneously constrain theproton's parton density functions which are the largest source of systematic uncertainty.This measurement is anticipated to reach an accuracy that is competitive to earlier leptoncollider results, and will be ground-breaking in achieving this at a hadron collider forthe first time.